Fluid-pressure regulator



' (N0 Model.)

E. L. SHARPNEGK &'G. F. KNOX.

FLUID PRESSURE REGULATOR..

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` NITED STATES' AT'FENT Prion...

ELIEL L. SHARPNECK AND GEORGE FfKYNOX, OF CHICAGO, ILLINOIS.

FLUID- PREQSASQURE (REG U L'A'To R.

SPECIFICATION forming part of Letters IIiateiitNo. 592,212, datedvvOctober 19, 189'?.

` Application led January 28, 189:6. Serial No. 577,123. (No model.)

.To all whom it may concern: A

Be itknown that we, ELIEL L. SHARPNECK and GEORGE F. KNOX, citizens of the Unitedv States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Fluid-Pres more especially to a regulator of the`class adapted'for use in refrigerating-machines which employ anhydrous ammonia as a coo1- ing agent, the regulator operating automatically to control the inflowof ammonia to the refrigerating coil or chamber, and being governed in its action by the pressure of ammonia-gas in the refrigerating coil or chamber,

whereby the said pressu reis maintained practically uniform.

rlhe object is to provide a.regulator of an improved, simple, and durable construction,

which may be set to limit the pressure in theY refrigerating'coil or chamber to any desired degree, and which will be exceedinglysensi-` tive and positive in its operation.

To the above endsthe invention consists in the general construction of the improved regulating device; and it further consists in;

direction ofthe arrow, andFig. 3 a broken' elevation of the upper endvportion-of the device.

A is an oblong shell or casing provided in its under side with a tubularextension A.

In the shell is a partition A2, and the upper surface of the partition and edge portions of the shell form two annular seats t t'. Fitting upon the seat t is an annular, preferably rubber, gasket s, and fitting upon the seat t is an annular, preferably rubber, gasket s. Fitting upon the seat formed by the gaskets is a movable abutment or iieXible diaphragm B, and tting upon the seat afforded by the gasket s' is a movable abutment or flexible diaphragm B'.

C is a frame or'casting having a circumferential base portion Q, which fits upon the rim Vter of the diaphragm B.

of the shell A, and a cross-plate Q', which fits upon and conforms to the upper edge portion or bearingsurface of the partition A2. On the base or rim Q, at opposite sides of the longitudinal center, are yokes Q2 Q2, connected together at opposite ends at theirtops by vertically-disposed cross-plates Q3 Q4. Journaled at opposite ends in the cross-plates Q3 Q4, and extending longitudinally and centrally between the yokes Q27 is a screw p, provided beyond the plate Q3 with a squared end p to receive a suitable crank. (Not shown.)

I) is a block or hanger provided in its upperend portion with a Vthreaded opening n to receive the screw p. At opposite sides of the upper end portion of the hanger are lugs or Wingsnt n2, which pass through and slide in longituvdinally-extending guide-slots Q5 in the yoke-frames Q2. the hanger D is `bifurcated and affords a recess n3, across which extends a roller n4, which AE is a link E', having a threaded stem portion Z, which passes through an opening in the cen- Surrounding the stem Z at the diaphragm are preferably rubber washers Z', and upon the stem and bearing against the s aid Washers are nuts Z2 Z3, which clamp the washers and diaphragm between them and fasten them to the stem Z.

vportion Za, tapered at its free end to afford .a valve Za.

The upper portion of the stem Zt is threaded and passes through 'an opening in the center of the diaphragm B. Surrounding the stem at opposite sides of the diaphragm are,preferablyrubber, washers 7a2 and upon the stem are nuts 7c3 7a4, which clamp the Washers and diaphragm between them and fasten them to the stem 7c. The diaphragms B B are clamped at their circumferential edges upon the gaskets s s by the rim Q and cross-plate Q' of the frame C by means of bolts or other fastening means, which secure them rigidly to the shell. The diaphragms B B form a gas-tight cover for the open end portion of the shell A, and the partition A2 is IOO provided with one or more openings 'i through it, so that the interior ot the shell A forms practically one continuous chamber A3. The stem 7.: passes through a winged guide or spider h in the tubular extension A, and in the lower part of the said tubular extension is a bushing 7L', provided with a small inlet port or passage 7b2, shaped at its upper end to afford a valve-seat 7b3 for the valve 7u'. Above the valve-seat 7L is an outlet-port 701. The lever E is fulcrumed upon the roller n* and the fulcrum may be changed at will by turning the screw p to move the hanger D longitudinally ot the yoke-frame.

In the device shown the diaphragms B B' are of the same size and present the same arca to the chamber A3. lVhen the roller or fulcrum ni is midway between the ends ofthe lever, the diaphragms will afford equal resistance against pressure of gas in the chamber A5, Movement of the fulcrum to the left in Fig. l will increase the relative leverage at the diaphragm l and diminish that at the diaphragm li, whereby gas-pressure in the chamber A3 exerted against the diaphragm 13 will overcome the resistance against the diaphragm B, so that the tendency will be to swing the lever E to raise the link E and lower the link E2, causing the valve ft" to be pressed against the seat h3 and close the inletport h2.

In practice, in a refrigerating apparatus, the port h2 will communicate with a liquidammonia-supply pipe, and the port h* will communicate with a pipe leading to the refrigeratiug coil or chamber. Presuming, for example, that the liquid ammonia is supplied under a pressure of, say, one hundred and fifty pounds to the inch, and it is desired to maintain a pressure of, say, forty pounds in the refrigerating conduit or coil, the fulcrum of the lever is so adjusted that pressure against the diaphragm B will overcome the same pressure against the diaphragm 13, supplemented by the pressure at the port h2 against the valve 7c', whenever the pressure in the chamber A exceeds forty pounds to the square inch. rllhus whenever the pressurein the chamber A3 and refrigerating coil or conduit (which are in open communication through the port fri) is below forty pounds to the square inch the pressure against the diaphragm ll, supplemented by that against the valve 7d, will overcome the resistance of the diaphragm l5', whereby the lever will be swung to open the valve 7L'. On the wing or lug n of the hanger D a pointer may be provided to move upon a scale to indicate the adjustment. The scale may, if desired, in-

dicate the number of pounds of pressure which are required in the refrigcrating coil or conduit to sluit oft the supply through the port h2.

The construction shown and described is particularly simple and inexpensive. It elnploys no springs and is not likely to get out of order. It is desirable in refrigerating apparatus, particularly of the smaller or domestic type, to provide for the most perfect regulation of pressure in the refrigerating coil or chamber, and for maintaining the said pressure practically constant and uniform. In the present device the adjustment by change of fulcrum, as described, affords regulating means which is not only as sensitive and positive in its action as could be desired, but which is easy to adjust and when once adjusted requires no attention whatever. It is not necessary that the diaphragms should be of the same area, though this construction is preferred. Any other form of diaphragms, whether fiexible,which is the form preferred, or inflexible, as in the case of pistons or other movable abutments, may be substituted for the form described without departure from the invention.

lVhile it is preferred to provide the device throughout as shown and described, it may be modified in the matter of details of construction without departing from the spirit 9o of the invention as defined by the claim.

lVhat we claim as new, and desire to secure by Letters Patent, is-

In a fluid-pressure regulator, the combina' tion of a chamber having a depending tubular portion provided with an inlet-port having a valve-seat, and with an outlet, separate diaphragms at said chamber movable under accumulated pressure therein, a valvestem connected with one of the diaphragms and carrying a valve for the seat at the inlet-port, a lever pivotally connected at opposite end portions with the respective diaphragms, and slotted between said end portions, a frame provided with longitudinallydisposed yokes having guide-slots, a transverse sliding block having lugs or wings movable in said slots and recessed to receive the lcv-er, a roller on the block engaging the slot in the lever to afford a fulcrum for the latter and a screw mounted in the frame and engaging a threaded openingr in the block to move the latter, substantially as and for the purpose set forth.

ELIEL L. SIIARPNECK. GEORGE F. KNOX.

In presence of- M. J. Fnos'r, J. N. IIANsoN.

IOC

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